1 // Copyright (C) 2011 The Libphonenumber Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef I18N_PHONENUMBERS_ENCODING_UTILS_H_ 16 #define I18N_PHONENUMBERS_ENCODING_UTILS_H_ 17 18 #include "phonenumbers/base/basictypes.h" 19 #include "phonenumbers/utf/unilib.h" 20 #include "phonenumbers/utf/utf.h" 21 22 namespace i18n { 23 namespace phonenumbers { 24 25 class EncodingUtils { 26 public: 27 // Decodes one Unicode code-point value from a UTF-8 array. Returns the number 28 // of bytes read from the array. If the array does not contain valid UTF-8, 29 // the function stores 0xFFFD in the output variable and returns 1. 30 static inline int DecodeUTF8Char(const char* in, char32* out) { 31 Rune r; 32 int len = chartorune(&r, in); 33 *out = r; 34 return len; 35 } 36 37 static const char* AdvanceOneUTF8Character(const char* buf_utf8) { 38 return buf_utf8 + UniLib::OneCharLen(buf_utf8); 39 } 40 41 static const char* BackUpOneUTF8Character(const char* start, 42 const char* end) { 43 while (start < end && UniLib::IsTrailByte(*--end)) {} 44 return end; 45 } 46 }; 47 48 } // namespace phonenumbers 49 } // namespace i18n 50 51 #endif // I18N_PHONENUMBERS_ENCODING_UTILS_H_ 52
